[OpenLayers-Users] Vector layer and multiple symbolizers

[Yves Gillet]

Hi again

apparently, using this strategy is not working because, sharing the
features between the parent and slaves layers has side effects in the
rendering process as you can see here
http://jsfiddle.net/jLEYS/6/(comment/comment lines 68,69 to see what i
d expect) :(

Regards
Yves.



2013/2/7 Yves Gillet <ygillet at gmail.com>

> Hi Xavier
>
> thanks for your solution using other layers, I'll give it a try.
> I thought about it also at a first place but I was afraid of the
> performance overhead to have potentially 4 more layers (of about 1000
> features each) to achieve that.
> After digging in the source code, another (more complicated) solution
> would have been to create a custom renderer which can create symbols
> compositions,
> for example in my case a svg renderer which could attach multiple child
> nodes to the feature node rendered.
> I havent yet figured how to do that, but maybe it could be a nice feature
> for openlayers and I may experiment with it if I have more time :)
>
> Regards
> Yves
>
>
> 2013/2/6 Xavier Mamano (jorix) <xavier.mamano at gmail.com>
>
> Hi Yves,
>>
>> It's not pretty, but could create a slave layer as:
>>
>> var mySlaveLayer = new OpenLayers.Layer.Vector("slave", {
>>    displayInLayerSwitcher: false,
>>    style: myOtherStyle
>> });
>> myLayer.events.on({
>>     'featuresadded': function(evt) {
>>         mySlaveLayer.addFeatures(evt.features.slice());
>>     },
>>     'featuresremoved': function(evt) {
>>         mySlaveLayer.removeFeatures(evt.features.slice());
>>     },
>>     'visibilitychanged': ....
>> });
>>
>> with two layers be sufficient, the numbers can be labels.
>>
>> You have a few hours of work for adjust this...
>>
>> Regards,
>>
>> Xavier Mamano
>>
>>
>> Yves G wrote
>> > Hi there,
>> > thanks for your input.
>> >
>> > But if you look my image mockup of what I m trying to display , I want
>> to
>> > style the station along with some of its attributes (sort of symbols
>> > composition, not just the point one) .
>> > I'd be glad if you could update my example here
>> > http://jsfiddle.net/jLEYS/3/ to
>> > show me how I could achieve that using the StyleMap
>> >
>> > Regards,
>> > Yves
>> >
>> >
>> >
>> > 2013/2/5 Sergeant_york <
>>
>> > electronicpanda@
>>
>> > >
>> >
>> >> var style = new OpenLayers.Style({
>> >>     externalGraphic: '${graphicFunction}',
>> >>      graphicYOffset: '${graphicYOffsetFunction}',
>> >>      graphicXOffset: '${graphicXOffsetFunction}',
>> >>     /* etc... */
>> >> }, {
>> >>     context: {
>> >>         graphicFunction: function(feature) {
>> >>             if(feature.attributes.type=='bike') return '/bike.png';
>> >>             else if(feature.attributes.type=='hospital') return
>> >> '/hospital.png';
>> >>             /*etc...*/
>> >>         },
>> >>         graphicYOffsetFunction: function(feature){
>> >>             if(feature.attributes.type=='bike') return 10;
>> >>             else if(feature.attributes.type=='hospital') return -10;
>> >>             /*etc...*/
>> >>         }, /*etc...*/
>> >>     }
>> >> });
>> >>
>> >>
>> >>
>> >> --
>> >> View this message in context:
>> >>
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